Seismic isolation apparatus and structure having seismic isolation apparatus

Abstract

To provide a seismic isolation apparatus which, as well as widening an applicable shaking range, can be easily configured and is low in height, a seismic isolation apparatus is configured of a low friction combination formed by a point contact between a planar hard plate base, which has a surface on which are disposed at least three convexly curved projections of a uniform height, and a glide plate which is a smooth, hard, flat plate.

1 . A seismic isolation apparatus, comprising:
 a low friction combination formed by a point contact between a planar hard plate base having a surface on which are disposed at least three convexly curved projections of a uniform height, and a glide plate which is a smooth, hard, flat plate.   
   
   
       2 . The seismic isolation apparatus according to  claim 1 , wherein
 a contact surface of at least one of the hard plate base and the glide plate has a surface layer formed of any one of stainless steel, aluminum, a steel plate, tetrafluoroethylene, polyacetal, polyethylene, polypropylene, vinyl chloride, nylon, ABS, polycarbonate, acryl, polyurethane, polyimide, polyester, polyolefin, a hard rubber, carbon powder, molybdenum disulfide powder, or a powder coating, baking coating, cation electrodeposition coating, or fluororesin coating thereof.   
   
   
       3 . The seismic isolation apparatus according to  claim 1 , wherein
 a lubricating oil or a lubricating grease, which is a viscous medium or a viscoelastic medium, is applied between the hard plate base and the glide plate, which are in point contact.   
   
   
       4 . The seismic isolation apparatus according to  claim 1 , wherein
 an elastic plate is affixed to one of an upper surface or a lower surface of the hard plate base and the glide plate in a superimposed condition.   
   
   
       5 . The seismic isolation apparatus according to  claim 1 , wherein
 the convexly curved projections have one more convex ring on a concentric circle on an exterior thereof.   
   
   
       6 . The seismic isolation apparatus according to  claim 1 , wherein
 the convexly curved projections form intermittent slits along a circumferential direction of a concentric circle on the exterior thereof.   
   
   
       7 . The seismic isolation apparatus according to  claim 1 , wherein
 a radius of curvature “r” at an apex of the convexly curved projections is 30 mm or more.   
   
   
       8 . The seismic isolation apparatus according to  claim 1 , wherein
 a whole of the hard plate base and the glide plate being an approximately rectangular flat plate, corner portions of four corners thereof are cut diagonally.   
   
   
       9 . A seismic isolation structure, wherein
 any of the seismic isolation apparatus according to  claim 1  is installed on one portion, or a whole, of lower foundation concrete which has a planar upper surface, and   upper foundation concrete of a building is formed on the seismic isolation apparatus, and taken as a foundation.   
   
   
       10 . The seismic isolation structure according to  claim 9 , wherein
 in seismic isolation apparatus disposed in a peripheral portion of the building, among the seismic isolation apparatus installed on the lower foundation concrete, a waterproofing agent is loaded into a space between the hard plate base and the glide plate which configure the seismic isolation apparatus.   
   
   
       11 . The seismic isolation structure according to  claim 9 , wherein
 a coupling fixing unit is provided in a desired place on a side extremity of a peripheral portion of the upper and lower foundation concrete, or on a side extremity surface of an internal notch, and   a movement unit that returns the upper foundation concrete to an initial position is provided between coupling fixing units.   
   
   
       12 . The seismic isolation structure according to  claim 11 , wherein
 in the movement unit, a sensor is inserted which can measure a lateral force required for a movement.   
   
   
       13 . The seismic isolation structure according to  claim 9 , wherein
 the structure is provided with a slope onto which the seismic isolation apparatus runs in the event of moving beyond a predetermined movement distance.   
   
   
       14 . A seismic isolation structure, wherein
 a seismic isolation floor is provided, formed leaving a movable range at one extremity side, using the seismic isolation apparatus according to  claim 1 , a non-seismic isolation floor is formed in contact with a wall on the side at which the movable range is left, and a portion toward a center of the non-seismic isolation floor and free end portion of the seismic isolation floor are slidably piled up with providing the seismic isolation apparatus therebetween.   
   
   
       15 . A seismic isolation structure, wherein
 as well as the structure being installed on the seismic isolation apparatus according to  claim 1 , a damper is added to a side surface or a rear surface of the structure as a shock-absorbing material.